Attachment for drills.



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ATTACHMENT FOB DRILLS. APPLICATION' man Aumzs. 19t-5.

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1. 1. am. ATTACHMENT FOR DRILLS.

APPLICATION. FILED AUG.23. T915.

Patented Dec. 5, 1916.

2 SHEETS-SHEET 2.

M mb @Ati PATENT FFE.

JOHN J. GILL, 0F MULLAN, IDAHO, ASSIGNOR 0F ONE-HALF TO HENRY BILLBERG,OF MULLAN, IDAHO.

ATTACHMENT FOR DRILLS.

Specification of Letters Patent.

Patented Dec. 5, 1.916.

Application led August 23, 1915. Serial No. 46,888.

T 0 all whom it may concern Be it known that I, Jol-IN J. GILL, acitizen of the United States, residing at Mullan. in the county ofShoshone and State of Idaho, have invented certain new and usefulImprovements in Attachments for Drills, of which the following isaspecification.

This invention has reference to attachments for drills, and its objectis to provide` an attachment for pneumatic rock drills, whereby thedrill tool has imparted to it a rotative movement by the attachmentduring its reciprocatory movement by the drill mechanism. j

In some types of rock drills the tool is reciprocated by the action ofairupon a piston carrying the tool, while in other types the drill doesnot travel with the reciprocating piston, but is subjected to the impactof the piston whereby the tool is caused to act by a series of hammerblows delivered to it'.

In order that the tool may be automatically rotated about itslongitudinal axis the present invention provides a turning mechanismunder the control of the air under pressure fed to, or the exhaust airfrom the drilling machine, and not only is the drill rotated while beingsubjected to blows of the reciprocating member, but` in case of the toolsticking air under full pressure may be applied to the turningmechanism.

While the structure of the present invention may be built in thepneumatic drills at the time such drills are manufactured, it is adaptedas an attachment to the hammer type of pneumatic drills already inexistence, and among other advantages it is so arranged as to be quitefree from injury from debris resulting from the drilling operation.

rlhe invention will be best understood from a consideration of thefollowing detailed description, taken in connection with theaccompanying' drawings forming a part of this specication, with thefurther understanding that while the drawings show a practical form ofthe invention, the latter is not confined to any strict conformity withthe showing of the drawings, but may be changed and modified so long assuch changes and modifications come within the scope of the appendedclaims.

In the drawings, Figure 1 is an elevation of the tool end of a rockdrill with the invention applied. Fig. 2 is a section on the line 2-2 ofFig. 1, the section being confined to the tool rotating mechanism, butomitting some of the working parts. Fig. 3 is a section on the line 3-3of Fig. 1. Fig. 4 is a section on the line l-- of Fig. 1. Fig. 5 is atop plan view` of the attachment with the drill tool in cross-section.Fig. 6 is a section on the line 6-6 of Fig. 2.

Referring to the drawings there is shown a pneumatic drill 1 which maybe taken as typical of any suitable form of rock drill, wherefore noattempt is made to show the working structure of the drill, since suchstructure does not enter into the present invention. Such a drillcustomarily terminates at one end in a flange 2 and to this flange thereis applied a flanged end 3 of a 4crown or end member 4 made fast to theflange 2 by bolts 5. The crown or end member 4. alines with the body ofthe drill and forms part of the structure of the present invention. Themember 4 is usually cylindrical in cross-section and has a longitudinalbore 6 which is countersunk, as shown at 7, at the end remote from theflange 3. rllhe member 4l is also formed at the end remote from thefiange 3 with a radially extended fla-nge 8 having at one side a furthereXtension 9.

Made fast to the 'flange 8 with its eXtension 9 is one part 10 of atwo-part casing 11, the two parts having inturned meeting lianges l2,13, fastened together by screws or bolts 14.

The casing 11 is of generally triangular cross-section with one side 15bowed outwardly, and the apex of the triangle of rounded or cylindricalform, as shown at 16. At the sides of the triangle diverging from theapex 16 the casing contains two pairs of cylinders 17, 1S, respectively,diverging like the sides of the casing with each cylinder opening intothe interior of the cylindrical portion 16 of the casing.

Extending through the casing and the section 10 thereof is a sleeve 19journaled in a collar 20 fitted in the countersink 7, this collar actingas a gland to confine packing 21 in the countersink.' The sleeve 19 hasa bore 22 conforming generally to the crosssectional shape of a drilltool 23, which latter may be of the customary form with equi-spacedsurface ribs 24:.

rIhe end of the casing remote from the flange 8 to which it is securedis formed into 110 an end plate upon which is mounted a head 26 whiclnasWell as the plate 25, has a passage therethrough for the drill tool 23.The passage through the plate 25 is sufficient to accommodate the sleeve19 and this sleeve enters but does not extend through the head 26. Thatend of the sleeve where entering the head 26 is countersunk and receivesan internal collar 27 conforming interiorly tothe tool 23 and serves inconjunction with the corresponding end of the vsleeve 19'to confinepacking 28 against the inner wall of a countersink 29 in the head 26,which head is bored from the cou-ntersink to permit the passage throughthe said portion of the Y head of the-collar 27.

' The head 26h'as a vchamber 30 formed Vtherein in position to 'alinewith the cylindrical portion 16 of the casing 11. The chamber 30 isentered aXiall-y by a threaded passage normally closed by a screw plugl31 formed with a bore 32 to receive one end 33 of a crank shaft 34, saidcrankshaft extending lengthwisev of the cylinder 16 and `at the endremote from the extension 33 provided with another extension 35. Theextension 33 is passed -through the` plate 25 which is suitably bored'for the purpose, and the crank shaft has crank portions 36, 37 in properposition Vto match the respective pairs Y Y offcylinder'sf17 and 18. Theextension 35 pa'sses'through a bearing sleeve 38 appropriately carriedby the section 10 of the casingand has a step bearing in a sleeve 39mounted in a boss 40 on the bottom of the yextension 9 of the flange 8.Within the casing section 10 the extension 35 is provided v with acircumferential Vseries of gear teeth 41 meshing lwith a gear wheel 42mounted on i Vand Vmade fast to the sleeve 19 within the casing section10.

In each cylinder 17 and 18 there is mountedr apiston 42 connected by apitman 43 to a respective one of the cranks 36 or 37, as the case maybe. Each cylinder 17 and 13 is closed at th'el end remote from thecylindrical portion 16 of the casing by a screw plug 44 or by any otherappropriate means.

In'th'e head 26 are divergent cylindrical bores 45 corresponding invposition .to the cylinders 17 and 18 and each bore 45 contains `a:hollow pistoni 4'6 connected by a pitman 47 :to 4a Vcani ring 48encircling a cam 49 on the extension 33 of the shaft 34.- Eachcylindrical bore 45v is closed'by a plug 50 and lea'c'hbore'communicatesby a port 51 to 'a correspending one of the cylinders17.

On' the rounded portion 15 of the casing 10 isa bess 52 with a threadedcountersunk portion 53' for the reception of a pipe 54 by means of whicheither primary air or eX- haust a-ir is` directed into the structure.The

boss 52 communicates with a passage 55 havingy divergent-branches 56within the head 26 and' leading tothe cylindrical bores 45 in the pathof an elongated port 57 in each of the pistons 46. The port 57communicates with the interior 58 of ay respective piston 46 and thatend of the piston remote from the pyitman 47 :is open so that during aportion 'of the stroke of the piston its interior is in communicationwith the port 51.

The head 26 adjacent to each bore 45 is provided with another passage 59leading to a corresponding one of the cylinders 18, and this passage 59is in the path of the port 57, so that at certain phases of thereciprocation of the piston 46 the supply passage 56 is brought intocommunication with the passage 59, but at this time the port 51 isclosed by the piston 46. Each cylinder 17 and 13 has an exhaust 'port60.

Wh'en air is admitted to the drilling machine in the usual way, thedrill tool is subjected to hammer blows by means of which vthe drillingis performed in the usual manner.

By the admission of air to the passage such air being either primary orexhaust air, and in the latter case still under considerablepressure,such compressed air finds its way to the valve pistons 46 andby the then active portions to one pair of cylinders 17 or 18, with theresult that the crank shaft 34 is driven retatively and the rotatiyemovement is imparted to the gear wheel 42, thus correspondingly rotatingthe drill tool, which, because of its shape, cannot rotateiiidependently of the sleeve 19 and the latter being keyed to the gearwheel 'must rotate with it.

The pistons 4211 i'n the cylinders 17 and- 1S and the reciprocatingvalve pistons or valves 46 provide two pairs o'f simple single-actingengines, so mounted 'with relation to the crank shaft that the power isapplied thereto in a practically continuous mani'ier.

.EvenI if the drill tool should stick, there is ample force in thecompressed air, and especially the primary air supply, to loosen suchtool so that a proper operation of the tool is insured at all times.

The attachment is applied tothe tool end of the drilling machine and nothaving any material side projections does not unbalanee the drillingmachine, nor is the drill rotating mechanism suliciently bulky o'r ofsuilicient weight to have any material effect uponv the working of themachine.

The head 26 is closed at all points except where traversed bfv the drilltool and at this point the lit of the drill tool may be quite clo's'e,so that no chips or other parts liable to wear the working structurewill` find access to the interior of the casing 10. Moreover, all partsextending through the casing 10 are packed so that the casing 10 mayreceive a considerable amount of lubricant, keeping the partsthoroughlyV lubricated at all times without attention.

lVhat is claimed is l. An attachment for pneumatic drills of thereciprocating hammer type, comprising a casing having means for itsattach ment to the tool end of the drilling machine and also providedwith means to be traversed by the drilling tool, and a plurality ofsingle-acting pneumatic engines lodged within the casing and each havingpositive connections to the means to be traversed by the drilling toolfor rotating said means together with the tool, said engines beingrelated to the means to be traversed by the tool for positively rotatingthe tool always in the same direction at each power stroke of therespective engine.

2. An attachment for pneumatic drills of the reciprocating hammer type,comprising a casing adapted to the tool end of the pneumatic drill, saidcasing having a rotatable sleeve therethrough shaped to be traversed byand fit the drill tool for rotating said tool, a plurality of pairs ofdivergent cylinders within the casing, pistons and piston rods in thecylinders, a crank shaft having cranks each engaged by the piston rodsof a corresponding pair of pistons, slide valves connected to the crankshaft for directing air in order to the cylinders, and gearingconnections between theorank shaft and the sleeve surrounding the drilltool.

3. An attachment for pneumatic rock drills of the reciprocating hammertype comprising a crown member having means for attachment to the toolend of the pneumatic drill and bored to be traversed by said tool, acasing carried by the crown member, a rotatable sleeve extending throughthe casing and journaled at the ends in the crown member and in the endof the casing remote from the crown member, and adapted to surround thetool in engagement therewith, a gear wheel within the casing carried bythe sleeve, a crank shaft journaled in the casing and having gear teethengaging the gear wheel, said casing being provided with pairs -ofcylinders in operative relation to the crank shaft, single-actingpistons within the cylinders and each connected to a respective crank ofthe crank shaft, a head applied to the casing, slide valves in the headprovided with air passages for feeding air to them, and other passagesleading to respective cylinders, and connections between the crank shaftand the slide valves with the slide valves and pistons in the cylinderstimed in operation to provide substantially constant power to the crankshaft and through the latter and the gearing to the sleeve receivino`the tool, whereby to cause rotation of said tool while at work.

Ll. An attachment for pneumatic drills of the reciprocating hammer type,comprising a casing adapted to be attached to the drill in surroundingrelation to the drill tool, said casing having convergent cylinderswithin it with a crank shaft located at the apex of the convergentcylinders, single-acting pistons within the Cylinders connected to thecrank shaft, convergent slide valves mounted on the casing andcommunicating with the cylinders for supplying compressed air thereto,the cylinders and slide valves being arranged on opposite sides of theportion of the casing traversed by the drill tool, a sleeve surroundingthe drill tool mounted for rotation in the casing, and gearingconnections between 'the crank shaft and sleeve with the latterconstantly engaging the tool, whereby rotation of the sleeve by thepistons acting through the gearing imparts rotative movement to thedrill tool irrespective of the movements imparted thereto by thedrilling machine.

5. An attachment for drilling machines of the reciprocating hammer type,comprising a casing with a sleeve extending therethrough in a lineapproximating the longitudinal center line of the casing, said casinghaving pairs of 'circumferential cylinders therein and itself formedinto a cylinder extending transversely of the first-named cylinders atthe angle of convergence of the first-named cylinders, a head for thecasing having cylindrical bores therein converging into anothercylindrical portion alining with the second-named cylindrical portion ofthe casing, the head having passages and ports communicating with thecylinders therein, slide valves in the cylinders and the head,single-acting pistons in the first-named cylinders, a crank shaftmounted on the casing in the longitudinal center line of the cylindricalportions of the casing and head at the apex of the approaching cylinderstherein, and gearing connections between the crank shaft and sleeve,whereby a drill tool extending through the sleeve is rotated bycompressed air supplied through the slide valves to the cylinders.

In testimony whereof l have aixed my signature in presence of twowitnesses.

JOHN J. GLL.

Witnesses:

WM. MULLEN, E. E. DAILEY.

Uopiles o' this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

